Page 8 Advertisements Column 1

Otago Daily Times, Issue 15705, 6 March 1913, Page 8

Sheet aluminium is now frequently used for making kitchen utensils and tho like, but theso are noticed to beeomo corroded without actual usago, as, for instance, when kept in stores. Tests made in Germany on the subject are intended to 6how the condition of the rusting,_ or rather efflorescence, on the metal, this being produced by oxidation. When the ooat is removed, the metal 16 seen to bo more or lcs3 deeply Ecored. Analysis shows that the coating, contains aluminium, lime, eilici, and magnesia. Sheet aluminium was exposed to tho action of (Jiatilled water or ordinary water, and this gave o more or less rapid attack. This was less rapid when tho plates wero placed in air and water in torn, but surfaco oxidation also occurred. It appears that tho water must contain oxygen in order to attack the metal. The effect increases with tho heat, and also in tho jitfieiico of carbonio acid